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| author | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2008-11-27 13:05:55 +0300 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2008-11-27 13:06:56 +0300 |
| commit | 59da21398e680e8100625d689c8bebee6a139e93 (patch) | |
| tree | 7d93f87d2942dac06367af8b3a269e9f6d557b29 /arch/s390/include/asm/ptrace.h | |
| parent | ed313489badef16d700f5a3be50e8fd8f8294bc8 (diff) | |
| download | linux-59da21398e680e8100625d689c8bebee6a139e93.tar.xz | |
[S390] fix system call parameter functions.
syscall_get_nr() currently returns a valid result only if the call
chain of the traced process includes do_syscall_trace_enter(). But
collect_syscall() can be called for any sleeping task, the result of
syscall_get_nr() in general is completely bogus.
To make syscall_get_nr() work for any sleeping task the traps field
in pt_regs is replace with svcnr - the system call number the process
is executing. If svcnr == 0 the process is not on a system call path.
The syscall_get_arguments and syscall_set_arguments use regs->gprs[2]
for the first system call parameter. This is incorrect since gprs[2]
may have been overwritten with the system call number if the call
chain includes do_syscall_trace_enter. Use regs->orig_gprs2 instead.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/include/asm/ptrace.h')
| -rw-r--r-- | arch/s390/include/asm/ptrace.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/s390/include/asm/ptrace.h b/arch/s390/include/asm/ptrace.h index a7226f8143fb..fb0ca4796d3b 100644 --- a/arch/s390/include/asm/ptrace.h +++ b/arch/s390/include/asm/ptrace.h @@ -321,8 +321,8 @@ struct pt_regs psw_t psw; unsigned long gprs[NUM_GPRS]; unsigned long orig_gpr2; + unsigned short svcnr; unsigned short ilc; - unsigned short trap; }; #endif |